A fast walk is maybe four miles an hour. The fasted running speed over short distances is something over 20 mile an hour. Those are the speed our brains have evolved to cope with.

The amazing thing is that we can in fact manage to ratchet up our reaction times to enable us to deal with far higher speeds - but if we find that 55 miles an hour - meaning 110 miles an hour relative speed to vehicles coming the other way - is boringly slow, I think we should question ourselves. In real terms 55 miles is very fast indeed.
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I've sometimes wished we could all have meters in our car, rather like in taxis, which would show us how much it is costing at the speed we are travelling.   Saving money isn't the highest motive, but it might be quite effective. And one thing no one had mentioned is that the faster we drive and the more fuel we burn, the more damage we do to the environment.
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I hope you took that policeman's number and reported him, Richard. If he could pull you over in those circumstances he had no justification for driving fast anyway.